Lawnmower starts but won't continue to run

After I prime the engine, it starts right away but dies immediately. I've replaced the intake manifold, fuel line, and air filter. Took carb apart and cleaned with carb cleaner. Blew every line out using my air compressor. Added Sea Foam to the gasoline. When I check the sparkplug, it's completely dry.

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Have this checked IMMEDIATELY. The exhaust manifold is near the firewall in the engine compartment. The intake for the heater and ventilation / AC system is right above it. If you have a poor connection from the engine to the manifold OR the manifold to the exhaust pipe, you run the risk of carbon monoxide poisoning.

I am guessing that you have to prime it to start it. Is that correct? If so, then it starts on the prime and then dies right away. Then the next thing is whether or not the carburetor is mounted on the fuel tank or separately. If it is mounted on the tank, then you will need to replace the diaphram between the two. If the carburetor is mounted separately, then you will need to remove the carburetor to clean and inspect it. With this set up the float and needle are somehow stuck or you have a hole that is plugged.

You may want to check the intake manifold coolant port tube, which is plastic and tends to get eaten away over time on this particular engine. This condition causes coolant to mix with fuel in the intake manifold, making the engine run rough, and ultimately not start.

The replacement tube is metal, and will solve the problem. A good mechanic will insure the intake is clean and dry during re-assembly.

i have the same problem on a 98 jimmy 4.3 4x4.
i replaced the fule pump and have good pressure.
new wiers & coil (good spark) no MIL & no codes.
will only start when primed. it will run & drive all day
with no problems.
but once it has been turned off (warm or cold) i will
have to prime it once again to start it.
i have another engine that was in it before it spun a bearing.
it ran fine so i know all parts are good.
i swaped the mass air flow and throttle body but i still have
to prime it everytime to start it. am i forgetting something?
should i swap out the intake with the injectors?
any help would be sweet. thanks.

It is the head gasket. Have that replaced and you will be fine. You have an air leak. I was told by the mechanic at mazda that the anti freeze eats away at the gaskets. CRAZY, but it works. I still have an issue with my 2001 Tribute revving while in park. Its always something.